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Method-and-intelligent-digital-beam-forming-system-for-interference-mitigation

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Method and intelligent digital beam forming system for interference mitigation

Details

Inventors: Turcotte, Randy Lee; Ma, Stephen Chih-Hung; Aguirre, Sergio;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Tarcza; Thomas H.
Assistant Examiner: Phan; Dao L.
Attorney, Agent or Firm: Gorrie; Gregory J.

An intelligent digital beam former (10) in conjunction with a satellite based array antenna (20) provides a plurality of dynamically controllable antenna beams (52) for communication with subscriber units (90) on earth's surface. Interference is mitigated placing a null in the transmit and receive antenna patterns at the location of the interfering signal by adjusting digital beam forming coefficients. As the interfering signal moves relative to the satellite, the interfering signal is tracked to maintain interference mitigation. The digital beam forming coefficients are also dynamically adjusted to help maximize signal quality of communications with subscriber units.

DETAILED DESCRIPTION OF THE DRAWINGS The present invention provides, among other things, a digital beam former suitable for use in array antennas.
In the preferred embodiment the digital beam former provides a method of mitigating interference from interfering signals.
The present invention also provides a method of tracking the location of interfering signals and readjusts the digital beam forming coefficients to create nulls in the antenna pattern directed towards that interfering signal.
The present invention also provides a digital beam former that mitigates interference from interfering signals.
The present invention also provides a method of communicating with communication terminals, subscriber units, relays or aircraft using an array antenna having a digital beam former.
In a preferred embodiment, digital beam forming coefficients are adjusted to improve or maximize the signal quality of communication signals received from the communication terminals.
In one embodiment of the present invention, the communication terminal provides the satellite with quality indicators which indicate the quality of the signals received by the communication terminal.
In response to received link quality indicators, the digital beam former on board the satellite dynamically adjusts its antenna beam pattern to help optimize the signal transmitted to the communication terminal.
In another embodiment of the present invention, the digital beam forming coefficients are readjusted to continually help maintain and help improve or maximize the signal quality of the received signals as the communication terminal and the satellite change their relative positions.
The present invention also provides a method of communicating with communication terminals using a digital beam former on board a satellite based array antenna.
The digital beam former coefficients are adjusted to provide more antenna beams to geographic regions having high demand for communication services and also adjusted to provide fewer antenna beams to regions having a low demand for communication services

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